netdev - Re: gem csum breakage with 018c5bba (Handle CHECKSUM

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Message-ID: <20131123014716.GA16661@gondor.apana.org.au>
Date:	Sat, 23 Nov 2013 09:47:17 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Alexander Graf <agraf@...e.de>
Cc:	David Miller <davem@...emloft.net>, alexander.h.duyck@...el.com,
	netdev@...r.kernel.org, edumazet@...gle.com,
	herbert@...dor.apana.org,
	"linux-kernel@...r.kernel.org list" <linux-kernel@...r.kernel.org>,
	Ben Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: gem csum breakage with 018c5bba (Handle CHECKSUM_COMPLETE more
 adequately ...)

On Fri, Nov 22, 2013 at 07:08:16PM +0100, Alexander Graf wrote:
> Hi,
> 
> With current Linus' master tree my ibook started emitting a lot of annoying csum calculation warnings. I've bisected it down to the commit seen in the subject line, but I suppose the real problem lies somewhere a lot deeper and only gets revealed thanks to the more clever checksum logic applied now.
> 
> Any ideas how to dig further into this?

Sorry, I don't have any docs on this device.  Perhaps Dave has
the docs which can tell us what RXDCTRL_TCPCSUM actually returns?

I assume it returns the correct checksum ending at the IP
packet boundary and only goes wrong when extra padding exists.

Hmm, I suppose the question then is what exactly does it do
if the packet isn't an IP packet?

Thanks,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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